„The aphorism “as a man thinketh in his heart so is he” contains the secret of life.“

— Bruce Lee

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„No healthy man, in his secret heart, is content with his destiny. He is tortured by dreams and images as a child is tortured by the thought of a state of existence in which it would live in a candy store and have two stomachs.“
— H.L. Mencken
„In the ice of solitude man becomes most inexorably a question to himself, and just because the question pitilessly summons and draws into play his most secret life he becomes an experience to himself.“
— Martin Buber
„A man is relieved and gay when he has put his heart into his work and done his best.“
— Ralph Waldo Emerson